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Abnormal Duration of Pregnancy 妊娠时限异常

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Definition • Spontaneous abortion: termination of pregnancy before the 28th week of gestation，the weight of fetus less than 1000g • 自然流产：妊娠不足28周，胎儿体重小于1000g而终止者 • <20 weeks from the first day of the last menstrual period or a fetus weighing <500g • 妊娠满20周以前，或体重小于500g （美国） • Miscarriage VS Abortion

incomplete abortion • Vaginal bleeding is profuse • Cervix is dilated • Some tissue filling the cervix • Size of the uterus is smaller than gestational age • The product of pregnancy is partial expelled. cervix opening • High risk in infection and shock • 妊娠产物部分排出，部分残留或嵌顿，持续阴道出血、量多，宫口扩张有物堵，子宫小于孕周

Special types • 习惯性流产(habitual abortion) three or more times of consecutive spontaneous abortion 自然流产连续发生≥3次，每次流产多发生在同一孕月 • 复发性自然流产（recurrent spontaneous abortion，RSA）spontaneous abortion occurs consecutively two or more times 连续2次或以上的自然流产